Big money was spent and a big collaboration was sung on Saturday night at the (RED) auction at Sotheby's in New York City.
The event, a joint effort between Bono and designers Jony Ive (Apple) and Marc Newson, reportedly raised almost $13 million -- which was apparently then doubled with a donation from Bill Gates. The money will benefit the Global Fund to fight AIDS, Tuberculosis and Malaria in Africa.
Before the auction began, Bono and The Edge took part in a jam session of sorts, performing a cover of Daft Punk's "Get Lucky" with Angelique Kidjo, Nile Rodgers and his band, Chic.
Then, during the auction itself, Bono and Chris Martin did a couple of songs on a piano that was being auctioned. With Martin on the piano bench and Bono standing behind, the pair sung a cover of Lou Reed's "Perfect Day" and then did U2's "Beautiful Day."
Bono and The Edge were back on stage with Kidjo and Rodgers during the afterparty, singing Chic's "Good Times" and a cover of David Bowie's "Let's Dance."